Objective To investigate the species composition, density, infestation rate, and seasonal variation of cockroaches in Shandong province, China, 2016-2020, to analyze the surveillance data of cockroaches captured by the sticky trap method, and to provide a scientific basis for cockroach prevention and control. Methods The surveillance data of cockroaches in Shandong province, 2016-2020 were collected and analyzed using Excel 2010 and R 3.6.0 softwares, and the distribution of monitoring sites was mapped using ArcGIS 10.3 software. Results From 2016 to 2020, a total of 22 846 cockroaches were captured in Shandong province, with Blattella germanica (99.49%) as the dominant species. The average total density was 0.47 cockroaches/sheet and the average infestation rate was 5.84%. The Cochran-Armitage trend test showed that the infestation rate of cockroaches statistically decreased over the years (Z=-13.011, P<0.001), but a small peak appeared in 2017. The infestation rate was highest in catering industry (9.83%), and the density was highest in supermarkets (0.92 cockroaches/sheet). Hotels showed the lowest cockroach infestation rate (4.30%) and density (0.21 cockroaches/sheet). The total cockroach density was high in July to September and peaked in July. The peak periods of infestation rate and density varied in different habitats. Conclusion B. germanica was the dominant species of cockroaches in Shandong province. Supermarkets and catering facilities are the prioritized places for cockroach control. Based on the seasonal variations of cockroach infestation rate and density in different habitats, integrated control measures should be taken before the peak periods to reduce cockroach density and its related diseases.
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